migrate i18n helper.js some code to typescript and migrate vue file to composition API and typescript

src/global.d.ts

@@ -10,3 +10,15 @@ interface Window {
         [key: string]: string | number | boolean | undefined | null;
     };
 }
+
+interface Navigator {
+    browserLanguage?: string;
+}
+
+declare module "framework7/components/notification" {
+    export namespace Notification {
+        export interface Notification {
+            destroy(): void;
+        }
+    }
+}